Table 5.

Comparison of p-values for the various treatment plans

Parameter	FW 1.05 vs 2.5	PF 0.287 vs 0.43	MF 3 vs 5
QF	p < 0.001	p = 0.253	p = 0.310
IOAW	p < 0.001	p = 0.354	p = 0.034
IOCW	p < 0.001	p = 0.225	p = 0.041
IOHW	p < 0.001	p = 0.411	p = 0.028
Beam-on time (s)	p < 0.001	p = 0.338	p < 0.001
D1% (Gy)
PTV56.00Gy	p < 0.001	p = 0.003	p = 0.791
PTV62.08Gy	p < 0.001	p = 0.344	p = 0.281
PTV67.20Gy	p < 0.001	p = 0.002	p = 0.336
D99% (Gy)
PTV56.00Gy	p < 0.001	p = 0.315	p = 0.111
PTV62.08Gy	p < 0.001	p = 0.317	p < 0.001
PTV67.20Gy	p < 0.001	p = 0.104	p = 0.004
V95% (%)
PTV56.00Gy	p = 0.001	p = 0.292	p = 0.150
PTV62.08Gy	p < 0.001	p = 0.247	p < 0.001
PTV67.20Gy	p < 0.001	p = 0.201	p = 0.049
D1% (Gy)
Brain stem	p < 0.001	p = 0.003	p < 0.001
Spinal cord	p = 0.397	p < 0.001	p = 0.007
PRV spinal cord	p = 0.011	p < 0.001	p = 0.010
Mandible	p < 0.001	p = 0.012	p = 0.006
V60Gy mandible (%)	p < 0.001	p = 0.416	p = 0.926
Dmean contralateral parotid (Gy)	p = 0.277	p = 0.010	p = 0.255
Dmean ipsilateral parotid (Gy)	p < 0.001	p = 0.005	p = 0.363

D_mean, mean dose; D_X%, dose in X% volume; FW, field width; IOA_W, weighted index of achievement; IOC_W, weighted index of coldness; IOH_W, weighted index of hotness; MF, modulation factor; PF, pitch; PRV, planning organ at risk volume; PTV, planning target volume; QF, quality factor; V_XGy, volume of the structure that is covered by the isodose X Gy.

Statistically significant results (confidence level α = 0.05) are in bold.

PTV_YGy excludes PTV_XGy for X > Y.